XLV. A photo-elastic study of stress waves

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Abstract
A method has been devised whereby the stress waves set up by impact in simple models may be examined by photography of the photo-elastic fringes associated with them. For this purpose an Arditron discharge tube, giving single flashes of high intensity and duration less than 1 microsecond, is used in conjunction with a circuit which is closed by the pellet and which triggers the flash when a suitable time interval from the instant of impact has elapsed. Fringe photographs are shown for a number of cases involving the impact of lead air-gun pellets with the edges of plates of photo-elastic material. In the materials tested the relationship between stress and birefringence appears to be of the same order with dynamic as with static stresses.

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